Oehler Research Inc.
http://www.oehler-research.com/
Olympic Arms Inc.
http://www.olyarms.com/
Outers
http://www.outers-guncare.com/
PACT Inc.
http://www.pact.com/
Para USA
http://www.paraord.com/
Pentax Corp.
http://www.pentaximaging.com/products/sport_optics/